Why are the poles of a power line in our street made of wood?

• Wood is a conductor- they stop electrical current from the power lines hitting the ground

• So that during thunderstorms in winter, there isn't as much electrical current in the power line

• Because electrons can move faster through wood compared to any other material

• Wood is an insulator- they stop electrical current from the power lines hitting the ground

What type of reaction is this?

• Exothermic

• Endothermic

• Potential

• Kinetic

A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true?

• It is an exothermic reaction

• It is an endothermic reaction

• None of the above

• All of the above

If they energy required to break the bonds is greater than the energy given out by making new bonds the reaction is

• Exothermic

• Endothermic

• Neutralisation

• Displacement

Fossil fuel is an energy providing material that comes from

• long-dead remains of living things.

• the center of the Earth.

• out space.

• the atmosphere.

Which is less reactive than sodium but cannot be extracted from its ore using carbon

• Magnesium

• Potassium

• Platinum

• Zinc

Which direction do the electrons flow in wire X and which metal is oxidized?

• A

• B

• C

• D

What type of decay is shown here

²³⁸₉₂U ---> ²³⁴₉₀Th + ⁴₂He.

• Alpha

• Gamma

• Beta

• None of the above

Identify the type of nuclear decay shown here

²¹⁴₈₃Bi → ⁰_-1e + ²¹⁴₈₄Po

• Alpha

• Gamma

• Beta

Fuel cells combine hydrogen and oxygen to produce........

• Electricity, power and nitrogen

• Electricity, heat and water

• heat, power and ammonia

• Sulfur dioxide, carbon monoxide and pure water